package cn.xsshome.algorithmNation.util;

import java.math.BigInteger;

public class Util {
	/**
	 * 整形转换成网络传输的字节流（字节数组）型数据
	 * 
	 * @param num
	 *            一个整型数据
	 * @return 4个字节的自己数组
	 */
	public static byte[] intToBytes(int num) {
		byte[] bytes = new byte[4];
		bytes[0] = (byte) (0xff & (num >> 0));
		bytes[1] = (byte) (0xff & (num >> 8));
		bytes[2] = (byte) (0xff & (num >> 16));
		bytes[3] = (byte) (0xff & (num >> 24));
		return bytes;
	}

	/**
	 * 四个字节的字节数据转换成一个整形数据
	 * 
	 * @param bytes
	 *            4个字节的字节数组
	 * @return 一个整型数据
	 */
	public static int byteToInt(byte[] bytes) {
		int num = 0;
		int temp;
		temp = (0x000000ff & (bytes[0])) << 0;
		num = num | temp;
		temp = (0x000000ff & (bytes[1])) << 8;
		num = num | temp;
		temp = (0x000000ff & (bytes[2])) << 16;
		num = num | temp;
		temp = (0x000000ff & (bytes[3])) << 24;
		num = num | temp;
		return num;
	}

	/**
	 * 长整形转换成网络传输的字节流（字节数组）型数据
	 * 
	 * @param num
	 *            一个长整型数据
	 * @return 4个字节的自己数组
	 */
	public static byte[] longToBytes(long num) {
		byte[] bytes = new byte[8];
		for (int i = 0; i < 8; i++) {
			bytes[i] = (byte) (0xff & (num >> (i * 8)));
		}

		return bytes;
	}

	/**
	 * 大数字转换字节流（字节数组）型数据
	 * 
	 * @param n
	 * @return
	 */
	public static byte[] byteConvert32Bytes(BigInteger n) {
		byte tmpd[] = (byte[]) null;
		if (n == null) {
			return null;
		}

		if (n.toByteArray().length == 33) {
			tmpd = new byte[32];
			System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
		} else if (n.toByteArray().length == 32) {
			tmpd = n.toByteArray();
		} else {
			tmpd = new byte[32];
			for (int i = 0; i < 32 - n.toByteArray().length; i++) {
				tmpd[i] = 0;
			}
			System.arraycopy(n.toByteArray(), 0, tmpd,
					32 - n.toByteArray().length, n.toByteArray().length);
		}
		return tmpd;
	}

	/**
	 * 换字节流（字节数组）型数据转大数字
	 * 
	 * @param b
	 * @return
	 */
	public static BigInteger byteConvertInteger(byte[] b) {
		if (b[0] < 0) {
			byte[] temp = new byte[b.length + 1];
			temp[0] = 0;
			System.arraycopy(b, 0, temp, 1, b.length);
			return new BigInteger(temp);
		}
		return new BigInteger(b);
	}

	/**
	 * 根据字节数组获得值(十六进制数字)
	 * 
	 * @param bytes
	 * @return
	 */
	public static String getHexString(byte[] bytes) {
		return getHexString(bytes, true);
	}

	/**
	 * 根据字节数组获得值(十六进制数字)
	 * 
	 * @param bytes
	 * @param upperCase
	 * @return
	 */
	public static String getHexString(byte[] bytes, boolean upperCase) {
		String ret = "";
		for (int i = 0; i < bytes.length; i++) {
			ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);
		}
		return upperCase ? ret.toUpperCase() : ret;
	}

	/**
	 * 打印十六进制字符串
	 * 
	 * @param bytes
	 */
	public static void printHexString(byte[] bytes) {
		for (int i = 0; i < bytes.length; i++) {
			String hex = Integer.toHexString(bytes[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			System.out.print("0x" + hex.toUpperCase() + ",");
		}
		System.out.println("");
	}

	/**
	 * Convert hex string to byte[]
	 * 
	 * @param hexString
	 *            the hex string
	 * @return byte[]
	 */
	public static byte[] hexStringToBytes(String hexString) {
		if (hexString == null || hexString.equals("")) {
			return null;
		}

		hexString = hexString.toUpperCase();
		int length = hexString.length() / 2;
		char[] hexChars = hexString.toCharArray();
		byte[] d = new byte[length];
		for (int i = 0; i < length; i++) {
			int pos = i * 2;
			d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
		}
		return d;
	}

	/**
	 * Convert char to byte
	 * 
	 * @param c
	 *            char
	 * @return byte
	 */
	public static byte charToByte(char c) {
		return (byte) "0123456789ABCDEF".indexOf(c);
	}

	/**
	 * 用于建立十六进制字符的输出的小写字符数组
	 */
	private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5',
			'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	/**
	 * 用于建立十六进制字符的输出的大写字符数组
	 */
	private static final char[] DIGITS_UPPER = { '0', '1', '2', '3', '4', '5',
			'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

	/**
	 * 将字节数组转换为十六进制字符数组
	 * 
	 * @param data
	 *            byte[]
	 * @return 十六进制char[]
	 */
	public static char[] encodeHex(byte[] data) {
		return encodeHex(data, true);
	}

	/**
	 * 将字节数组转换为十六进制字符数组
	 * 
	 * @param data
	 *            byte[]
	 * @param toLowerCase
	 *            <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
	 * @return 十六进制char[]
	 */
	public static char[] encodeHex(byte[] data, boolean toLowerCase) {
		return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
	}

	/**
	 * 将字节数组转换为十六进制字符数组
	 * 
	 * @param data
	 *            byte[]
	 * @param toDigits
	 *            用于控制输出的char[]
	 * @return 十六进制char[]
	 */
	protected static char[] encodeHex(byte[] data, char[] toDigits) {
		int l = data.length;
		char[] out = new char[l << 1];
		// two characters form the hex value.
		for (int i = 0, j = 0; i < l; i++) {
			out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
			out[j++] = toDigits[0x0F & data[i]];
		}
		return out;
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * 
	 * @param data
	 *            byte[]
	 * @return 十六进制String
	 */
	public static String encodeHexString(byte[] data) {
		return encodeHexString(data, true);
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * 
	 * @param data
	 *            byte[]
	 * @param toLowerCase
	 *            <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
	 * @return 十六进制String
	 */
	public static String encodeHexString(byte[] data, boolean toLowerCase) {
		return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * 
	 * @param data
	 *            byte[]
	 * @param toDigits
	 *            用于控制输出的char[]
	 * @return 十六进制String
	 */
	protected static String encodeHexString(byte[] data, char[] toDigits) {
		return new String(encodeHex(data, toDigits));
	}

	/**
	 * 将十六进制字符数组转换为字节数组
	 * 
	 * @param data
	 *            十六进制char[]
	 * @return byte[]
	 * @throws RuntimeException
	 *             如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
	 */
	public static byte[] decodeHex(char[] data) {
		int len = data.length;

		if ((len & 0x01) != 0) {
			throw new RuntimeException("Odd number of characters.");
		}

		byte[] out = new byte[len >> 1];

		// two characters form the hex value.
		for (int i = 0, j = 0; j < len; i++) {
			int f = toDigit(data[j], j) << 4;
			j++;
			f = f | toDigit(data[j], j);
			j++;
			out[i] = (byte) (f & 0xFF);
		}

		return out;
	}

	/**
	 * 将十六进制字符转换成一个整数
	 * 
	 * @param ch
	 *            十六进制char
	 * @param index
	 *            十六进制字符在字符数组中的位置
	 * @return 一个整数
	 * @throws RuntimeException
	 *             当ch不是一个合法的十六进制字符时，抛出运行时异常
	 */
	protected static int toDigit(char ch, int index) {
		int digit = Character.digit(ch, 16);
		if (digit == -1) {
			throw new RuntimeException("Illegal hexadecimal character " + ch
					+ " at index " + index);
		}
		return digit;
	}

	/**
	 * 数字字符串转ASCII码字符串
	 * 
	 * @param String
	 *            字符串
	 * @return ASCII字符串
	 */
	public static String StringToAsciiString(String content) {
		String result = "";
		int max = content.length();
		for (int i = 0; i < max; i++) {
			char c = content.charAt(i);
			String b = Integer.toHexString(c);
			result = result + b;
		}
		return result;
	}

	/**
	 * 十六进制转字符串
	 * 
	 * @param hexString
	 *            十六进制字符串
	 * @param encodeType
	 *            编码类型4：Unicode，2：普通编码
	 * @return 字符串
	 */
	public static String hexStringToString(String hexString, int encodeType) {
		String result = "";
		int max = hexString.length() / encodeType;
		for (int i = 0; i < max; i++) {
			char c = (char) hexStringToAlgorism(hexString.substring(i
					* encodeType, (i + 1) * encodeType));
			result += c;
		}
		return result;
	}

	/**
	 * 十六进制字符串装十进制
	 * 
	 * @param hex
	 *            十六进制字符串
	 * @return 十进制数值
	 */
	public static int hexStringToAlgorism(String hex) {
		hex = hex.toUpperCase();
		int max = hex.length();
		int result = 0;
		for (int i = max; i > 0; i--) {
			char c = hex.charAt(i - 1);
			int algorism = 0;
			if (c >= '0' && c <= '9') {
				algorism = c - '0';
			} else {
				algorism = c - 55;
			}
			result += Math.pow(16, max - i) * algorism;
		}
		return result;
	}

	/**
	 * 十六转二进制
	 * 
	 * @param hex
	 *            十六进制字符串
	 * @return 二进制字符串
	 */
	public static String hexStringToBinary(String hex) {
		hex = hex.toUpperCase();
		String result = "";
		int max = hex.length();
		for (int i = 0; i < max; i++) {
			char c = hex.charAt(i);
			switch (c) {
			case '0':
				result += "0000";
				break;
			case '1':
				result += "0001";
				break;
			case '2':
				result += "0010";
				break;
			case '3':
				result += "0011";
				break;
			case '4':
				result += "0100";
				break;
			case '5':
				result += "0101";
				break;
			case '6':
				result += "0110";
				break;
			case '7':
				result += "0111";
				break;
			case '8':
				result += "1000";
				break;
			case '9':
				result += "1001";
				break;
			case 'A':
				result += "1010";
				break;
			case 'B':
				result += "1011";
				break;
			case 'C':
				result += "1100";
				break;
			case 'D':
				result += "1101";
				break;
			case 'E':
				result += "1110";
				break;
			case 'F':
				result += "1111";
				break;
			}
		}
		return result;
	}

	/**
	 * ASCII码字符串转数字字符串
	 * 
	 * @param String
	 *            ASCII字符串
	 * @return 字符串
	 */
	public static String AsciiStringToString(String content) {
		String result = "";
		int length = content.length() / 2;
		for (int i = 0; i < length; i++) {
			String c = content.substring(i * 2, i * 2 + 2);
			int a = hexStringToAlgorism(c);
			char b = (char) a;
			String d = String.valueOf(b);
			result += d;
		}
		return result;
	}

	/**
	 * 将十进制转换为指定长度的十六进制字符串
	 * 
	 * @param algorism
	 *            int 十进制数字
	 * @param maxLength
	 *            int 转换后的十六进制字符串长度
	 * @return String 转换后的十六进制字符串
	 */
	public static String algorismToHexString(int algorism, int maxLength) {
		String result = "";
		result = Integer.toHexString(algorism);

		if (result.length() % 2 == 1) {
			result = "0" + result;
		}
		return patchHexString(result.toUpperCase(), maxLength);
	}

	/**
	 * 字节数组转为普通字符串（ASCII对应的字符）
	 * 
	 * @param bytearray
	 *            byte[]
	 * @return String
	 */
	public static String byteToString(byte[] bytearray) {
		String result = "";
		char temp;

		int length = bytearray.length;
		for (int i = 0; i < length; i++) {
			temp = (char) bytearray[i];
			result += temp;
		}
		return result;
	}

	/**
	 * 二进制字符串转十进制
	 * 
	 * @param binary
	 *            二进制字符串
	 * @return 十进制数值
	 */
	public static int binaryToAlgorism(String binary) {
		int max = binary.length();
		int result = 0;
		for (int i = max; i > 0; i--) {
			char c = binary.charAt(i - 1);
			int algorism = c - '0';
			result += Math.pow(2, max - i) * algorism;
		}
		return result;
	}

	/**
	 * 十进制转换为十六进制字符串
	 * 
	 * @param algorism
	 *            int 十进制的数字
	 * @return String 对应的十六进制字符串
	 */
	public static String algorismToHEXString(int algorism) {
		String result = "";
		result = Integer.toHexString(algorism);

		if (result.length() % 2 == 1) {
			result = "0" + result;

		}
		result = result.toUpperCase();

		return result;
	}

	/**
	 * HEX字符串前补0，主要用于长度位数不足。
	 * 
	 * @param str
	 *            String 需要补充长度的十六进制字符串
	 * @param maxLength
	 *            int 补充后十六进制字符串的长度
	 * @return 补充结果
	 */
	static public String patchHexString(String str, int maxLength) {
		String temp = "";
		for (int i = 0; i < maxLength - str.length(); i++) {
			temp = "0" + temp;
		}
		str = (temp + str).substring(0, maxLength);
		return str;
	}

	/**
	 * 将一个字符串转换为int
	 * 
	 * @param s
	 *            String 要转换的字符串
	 * @param defaultInt
	 *            int 如果出现异常,默认返回的数字
	 * @param radix
	 *            int 要转换的字符串是什么进制的,如16 8 10.
	 * @return int 转换后的数字
	 */
	public static int parseToInt(String s, int defaultInt, int radix) {
		int i = 0;
		try {
			i = Integer.parseInt(s, radix);
		} catch (NumberFormatException ex) {
			i = defaultInt;
		}
		return i;
	}

	/**
	 * 将一个十进制形式的数字字符串转换为int
	 * 
	 * @param s
	 *            String 要转换的字符串
	 * @param defaultInt
	 *            int 如果出现异常,默认返回的数字
	 * @return int 转换后的数字
	 */
	public static int parseToInt(String s, int defaultInt) {
		int i = 0;
		try {
			i = Integer.parseInt(s);
		} catch (NumberFormatException ex) {
			i = defaultInt;
		}
		return i;
	}

	/**
	 * 十六进制串转化为byte数组
	 * 
	 * @return the array of byte
	 */
	public static byte[] hexToByte(String hex) throws IllegalArgumentException {
		if (hex.length() % 2 != 0) {
			throw new IllegalArgumentException();
		}
		char[] arr = hex.toCharArray();
		byte[] b = new byte[hex.length() / 2];
		for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
			String swap = "" + arr[i++] + arr[i];
			int byteint = Integer.parseInt(swap, 16) & 0xFF;
			b[j] = new Integer(byteint).byteValue();
		}
		return b;
	}

	/**
	 * 字节数组转换为十六进制字符串
	 * 
	 * @param b
	 *            byte[] 需要转换的字节数组
	 * @return String 十六进制字符串
	 */
	public static String byteToHex(byte b[]) {
		if (b == null) {
			throw new IllegalArgumentException(
					"Argument b ( byte array ) is null! ");
		}
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = Integer.toHexString(b[n] & 0xff);
			if (stmp.length() == 1) {
				hs = hs + "0" + stmp;
			} else {
				hs = hs + stmp;
			}
		}
		return hs.toUpperCase();
	}

	public static byte[] subByte(byte[] input, int startIndex, int length) {
		byte[] bt = new byte[length];
		for (int i = 0; i < length; i++) {
			bt[i] = input[i + startIndex];
		}
		return bt;
	}
}
